Thread: 04+ Gp with monsoon and onstar double din headunit swap

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  1. #14 Re: 04+ Gp with monsoon and onstar double din headunit swap 
    simbah
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    Default 01-30-2013
    If you have the Monsoon sound system and you intend to keep the Monsoon amp then you will need the GMOS-04 adapter and it will run you anywhere from $80-$120 depending on where you purchase it.
    Last edited by simbah; 01-30-2013 at 04:25 PM.
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